Alloy



' To all whom it may comm:

Patented June "16, 1925.

UNITED STATES ATE OFFICE.

' r m GIBIN, orirams, amen, ASSIGNOB :ro socrmmomxn nn comment,

a IOWBAULT & DEOLZEVILLB, PARIS, FRANCE.

Io Drawing:

.Be a known that I, PIERRE Gm1n',a citizen of the Republic of France, residing at 84 Rue 'deLille, Paris, Seine, France, engineer, 7 have invented new and useful Improvements in Alloys, which is fully set forth in the following specification, r

, This invention relates to a modification of or an improvement in thatdescribed in my 986, and has for object improvements in the alloy described in that application, primarily with a view to adapting the said alloy to particular conditions of the manufacture on a large scale in a metallurgical apparatus such as the'Martin furnace. To this end the invention increases the content in manganese from. 1 per cent to 5 per cent and lowers the content of chromium from 10 to 8 er cent.

rther, the'content of tun ten and of molybdenum may be diminishe without injury to the main qualities of the alloy.. In

fact, small additionsof these accessory con 'stituents already bring about an improvement in the particular properties of these alloys in resistin corroslon.

- It has been ound thatthealloy'made as described in the aforesaid application, or as -described in the present specification, may

be used for the manufacture of. various'mechanical parts such as turbine blades, valves,

the parts of cocks, etc. I V

The alloy forming the subject matter of the present invention contains essentially iron, a high content 'of nickel, chromium, manganese and carbon. It may include accessorily tungsten, molybdenum, cobalt, vanadium andtitanium. It is easy to obtain in large quantities and capable of being cast, forged, rolled, drawn and worked.

4 The typical alloy comprises besides the iron.

I Percent. 1 Nickel 25 to 40 Chromium 8 to 15 Manganese 0.5to 5 Carbon 0.3 to 1 If" necessary, as improving the mechanical properties, but by wayof accessories:

* Application ma December a, mo. Serial no.

7 Percent. 0 t0 Tun n 0.5 to 5. Moly denum 0.2 to- 3 Vanadium 0.2 to ,1 Titanium 0.1 to 0.2

Example of composition: Ni :28, (ll-:14, Mn 21.5, (3:0.5, iron: the rest.

The maximum, content for manganese and minimum for chromium are carried respectively to 5 per cent and 8 per cent in order to agree with the necessities of the reparation, the yields and the nature-of t e materlals added in usin the Martin furnace.

The presence 0 manganese is indispensable to ensure the perfect homogeneity of the metal as well as a satisfactory capacity for being forged.

Certain modifications of composition may be" made without introducing important modifications of quality. Thus one may add from 0.5 to 5 per cent oftungsten, or 0.2'to 3 per cent of molybdenum, or even use these two bodies in simultaneous addition; it may be 0.2 to 5 per cent in toto.

Thisextension of the content in tungsten and molybdenum indicated in the aforesaid application is due to new experience which has proved the: efliciency of these metals even in small proportion in affording the alloys res1stance to corrosion.

The properties may be further improved I and the manufacture facilitated by adding toQthe alloy defined above itma be 0.2 to 1 per cent of vanadium, it may per cent titanium, or 0.1 to 1 per cent of a mixture of vanadium: and titanium. Cobalt from 0 to 10 per cent may also be added with a view of improving the. mechanical strength ofthe alloy. The contents of additional elements indicated are at the cost of. I I

the content of iron.

Accordingto the content of nickel ado ted the variation of dilation obtained will bc .from 8X10 to 17 X10" and it will consequentlybe ssible to realize those of steel, 11x10", 0 bronze,-17X10", .or even of glass, s 10-'.

The alloys made in accordance with the aforesaid application or those made in accordance with the present disclosure, are useful for the construction of steam turbine blades and all other mechanical parts which have to work in superheated steam, saturated steam dried or moist, such as valves, seats of valves, parts of steam cocks, nozzles, elements of distributors, internal combustion engine valves, needle injection valves of internal combustion engines, and parts which have to work in hot gases oratmospheres dry or damp. I

y the expression metal of the chromium group as used in the claims, Iintend to cover either chromium alone or chromium with one or more of the other metals of the chromium group.

Having thus described the nature of the said invention and the best means I know of carrying the same into practical eflect, I claim 1 1. An alloy of the character described containing nickel 25 to 40 per cent, metal of the chromium group appreciably in ex cess of 8 and not more than 15 per cent, manganese 0.5 to per cent, carbon 0.3-to 1 per cent and the remainder iron.

2. An alloy of the character described containing nickel 25 to 40 per cent, metal of the chromium group appreciably in excess of 8 and not more than per cent, manganese 0.5 to 5 per cent, carbon 0.3 to 1 per cent, tungsten 0.5 to 5 er cent, molybdenum 0.2 to 3 per cent and t e remainder iron.

3. An alloy of the character described containing nickel to per cent, metal of the chromium group appreciably in excess of 8 and not more than 15 per cent, manganese 0.5 to 5 per cent, carbon 0.3 to 1 per cent, a tungsten metal 0.2 to 5 per cent and the remainder iron.

4. An alloy of the character described containing nickel 25 to 40 per cent, metal of the chromium grou appreciably in excess of 8 and not more t 1an 15 per cent, manganese 0.5 to 5 per cent, carbon 0.3 to l per cent, molybdenum 0.2 to 3 per cent and the remainder iron.

5. An alloy of the character described containing nickel 25 to 40 per cent, metal of the chromium group appreciably in excess of 8 and not more than 15 per cent, manganese 0.5 to 5 per cent, carbon 0.3 to 1 per cent, a tungsten metal 0.2 to -5 per cent, vanadium 0.1 to 1 per cent and the remainder iron.

In testimony whereof Ihave signed this specification.

i PIERRE GIRIN. 

